Battery shell and battery

Abstract

The invention belongs to the technical field of batteries, and discloses a battery shell and a battery, the battery shell comprises a shell body and an explosion-proof valve, the shell body comprises a plurality of wall surfaces, any one of the plurality of wall surfaces is provided with a mounting boss provided with a mounting groove, the thickness size of the wall surface provided with the mounting boss is t1, and t2 is greater than t3; the thickness dimension of the wall face without the installation boss is t2, t1 > t2, the length dimension of the installation boss in the first direction is L1, the length dimension of the installation groove in the first direction is L2, (L1-L2) / 2 > = 1 mm, and the anti-explosion valve is arranged in the installation groove. The mounting boss is arranged as a reinforcing structure, and the thickness of the wall surface provided with the mounting boss is greater than that of other wall surfaces without the mounting boss, so that the structural strength of the wall surface for placing the explosion-proof valve is reinforced by using a dual structure, the dragging force to the explosion-proof valve when the shell body deforms is reduced, the failure risk is reduced, and the service life of the explosion-proof valve is prolonged. And the safety is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of batteries, and in particular to a battery casing and a battery. Background Art

[0002] With the continuous development of technology, users have higher and higher requirements for new energy batteries. In order to improve the safety performance of battery cells, explosion-proof valves are usually installed on battery cells as pressure relief protection. When the battery cells operate abnormally and produce gas inside, the gas can be discharged through the explosion-proof valve to avoid major safety accidents.

[0003] At present, the explosion-proof valve of the battery cell is usually located on the cover plate, but the cover plate also has a pole with an electrical connection function. As a safety function, the explosion-proof valve needs to be opened when the battery cell has thermal runaway to discharge gas, causing electrolyte spraying and possible sparks and fires, thus causing the problem of electrothermal interference and posing a safety hazard.

[0004] Therefore, in order to solve the above problems, an explosion-proof valve is installed on the shell to avoid the problem of electrical thermal interference when the pressure is released and the exhaust is carried out during thermal runaway. However, due to the thin wall thickness of the shell and the gas generated by the battery cell during cyclic discharge, the shell wall surface is bulged and deformed, and the explosion-proof valve installed on the shell wall surface is pulled, resulting in notch deformation, leakage, and changes in the explosion value, high risk of failure, and poor safety. Summary of the invention

[0005] The object of the present invention is to provide a battery housing and a battery, which have high structural strength, avoid the problems of leakage and change of explosion value caused by deformation, have low failure risk and high safety.

[0006] To achieve this object, the present invention adopts the following technical solutions:

[0007] In one aspect, a battery housing is provided, the battery housing comprising:

[0008] The shell body comprises a plurality of wall surfaces, any one of the plurality of wall surfaces is provided with a mounting boss, a mounting groove is provided on the mounting boss, a through hole is provided in the mounting groove, and two adjacent wall surfaces are connected via an arc angle transition;

[0009] The thickness dimension of the wall surface provided with the mounting boss is t1, the thickness dimension of the wall surface not provided with the mounting boss is t2, and t1>t2 is satisfied, the length dimension of the mounting boss along the first direction is L1, the length dimension of the mounting groove along the first direction is L2, and (L1-L2) / 2≥1mm is satisfied;

[0010] An explosion-proof valve is arranged in the installation groove and welded to the shell body.

[0011] Optionally, a spacing dimension between the mounting boss and the arc corner along the first direction is L3, and satisfies L3≥2mm.

[0012] Optionally, the weld width dimension of the explosion-proof valve and the shell body is e, and satisfies 0.6mm≤e≤1.5mm.

[0013] Optionally, the depth of penetration of the explosion-proof valve and the shell body is w, and w>0.3mm.

[0014] Optionally, a thickness dimension t1 of the wall surface provided with the mounting boss and a thickness dimension t2 of the wall surface not provided with the mounting boss satisfy 0.1 mm ≤ (t1 - t2) ≤ 1.1 mm.

[0015] Optionally, a thickness dimension t1 of the wall surface provided with the mounting boss satisfies 0.6 mm ≤ t1 ≤ 1.5 mm;

[0016] The thickness dimension t2 of the wall surface without the mounting boss satisfies 0.3 mm ≤ t2 ≤ 0.7 mm.

[0017] Optionally, a depth dimension of the mounting groove along the second direction is h1, and satisfies 0.3 mm ≤ h1 ≤ 0.6 mm.

[0018] Optionally, a thickness dimension of a region with the largest thickness along the second direction in the explosion-proof valve is h2, and h1≥h2.

[0019] Optionally, a height dimension of the mounting boss along the second direction is h, and satisfies h1<h≤1mm.

[0020] On the other hand, a battery is provided, comprising a battery cover, a pole group and a battery casing as described in any one of the above items, wherein the battery cover is connected to the battery casing to form a closed chamber for accommodating the pole group.

[0021] Beneficial effects of the present invention:

[0022] The present invention provides a battery shell, which, on the one hand, is provided with a mounting boss on any wall surface of a shell body, so that when an explosion-proof valve is connected to a mounting groove of the mounting boss, the mounting boss is used as a reinforcing structure to strengthen the structural strength of the wall surface for placing the explosion-proof valve, and on the other hand, the thickness of the wall surface provided with the mounting boss is greater than the thickness of other walls not provided with the mounting boss, thereby further strengthening the structural strength of the wall surface for placing the explosion-proof valve, thereby utilizing double structural reinforcement to reduce the pulling force on the explosion-proof valve when the shell body is deformed, avoiding the problems of leakage and burst value change of the explosion-proof valve due to the deformation of the shell body, reducing the risk of failure, and improving safety, and by limiting the difference between the length dimension L1 of the mounting boss along the first direction and the length dimension L2 of the mounting groove along the first direction, so that (L1-L2) / 2≥1mm, sufficient area is provided for welding the explosion-proof valve and the mounting boss, thereby ensuring the structural strength of the connection between the explosion-proof valve and the mounting boss after welding.

[0023] The present invention also provides a battery, which, by applying the above-mentioned battery shell, reduces the problems of leakage and change in explosion value caused by the pulling of the explosion-proof valve due to deformation of the shell body, and has high quality and safety in use. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a partial structural cross-sectional view of the battery housing provided by the present invention after the outer shell body and the explosion-proof valve are welded;

[0025] Figure 2 It is a schematic diagram of the structure after the outer shell body and the explosion-proof valve in the battery shell provided by the present invention are welded;

[0026] Figure 3 It is a schematic structural diagram of the battery housing provided by the present invention after being assembled with a testing tool for performing airtightness testing.

[0027] In the figure:

[0028] 100. Inspection tooling; 200. Sealing ring;

[0029] 1. Shell body; 11. Mounting boss; 12. Through hole; 13. Arc angle;

[0030] 2. Explosion-proof valve. DETAILED DESCRIPTION

[0031] The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It is to be understood that the specific embodiments described herein are only used to explain the present invention, rather than to limit the present invention. It should also be noted that, for ease of description, only parts related to the present invention, rather than all structures, are shown in the accompanying drawings.

[0032] In the description of the present invention, unless otherwise clearly specified and limited, the terms "connected", "connected", and "fixed" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0033] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0034] In the description of this embodiment, the terms "upper", "lower", "right", etc., directions or positional relationships are based on the directions or positional relationships shown in the drawings, and are only for the convenience of description and simplification of operation, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are only used to distinguish in the description and have no special meaning.

[0035] Since the explosion-proof valve provided on the shell will be affected by the deformation of the shell, the explosion-proof valve will be deformed, resulting in leakage and change of the explosion value, resulting in high failure risk and poor safety.

[0036] Therefore, in order to improve the structural strength of the shell, avoid the problem of leakage and change of explosion value of the explosion-proof valve caused by shell deformation, reduce the risk of failure, and improve safety, this embodiment provides a battery shell.

[0037] like Figures 1 to 3As shown, the battery shell includes a shell body 1 and an explosion-proof valve 2, the shell body 1 includes multiple wall surfaces, any one of the multiple wall surfaces is provided with a mounting boss 11, a mounting groove is provided on the mounting boss 11, a through hole 12 is provided in the mounting groove, and two adjacent wall surfaces are transitionally connected via an arc angle 13, the thickness dimension of the wall surface provided with the mounting boss 11 is t1, the thickness dimension of the wall surface not provided with the mounting boss 11 is t2, and t1>t2 is satisfied, the length dimension of the mounting boss 11 along the first direction is L1, the length dimension of the mounting groove along the first direction is L2, and (L1-L2) / 2≥1mm is satisfied, and the explosion-proof valve 2 is arranged in the mounting groove and welded to the shell body 1.

[0038] On the one hand, the battery shell is provided with a mounting boss 11 on any wall surface of the shell body 1, so that when the explosion-proof valve 2 is connected to the mounting groove of the mounting boss 11, the mounting boss 11 is used as a reinforcing structure to strengthen the structural strength of the wall surface for placing the explosion-proof valve 2. On the other hand, the thickness of the wall surface provided with the mounting boss 11 is greater than the thickness of other walls not provided with the mounting boss 11, thereby further strengthening the structural strength of the wall surface for placing the explosion-proof valve 2, thereby utilizing double structural reinforcement to reduce the pulling force on the explosion-proof valve 2 when the shell body 1 is deformed, avoiding the problems of leakage and burst value change of the explosion-proof valve 2 due to the deformation of the shell body 1, reducing the risk of failure, and improving safety. In addition, by limiting the difference between the length dimension L1 of the mounting boss 11 along the first direction and the length dimension L2 of the mounting groove along the first direction, it satisfies (L1-L2) / 2≥1mm, thereby providing sufficient area for welding the explosion-proof valve 2 and the mounting boss 11, and ensuring the structural strength of the connection between the explosion-proof valve 2 and the mounting boss 11 after welding.

[0039] In this embodiment, the difference between the length dimension L1 of the mounting boss 11 along the first direction and the length dimension L2 of the mounting groove along the first direction, in addition to providing sufficient area for welding the explosion-proof valve 2 and the mounting boss 11, is also required to set a draft angle when forming the mounting boss 11. Therefore, the difference between the length dimension L1 of the mounting boss 11 along the first direction and the length dimension L2 of the mounting groove along the first direction is (L1-L2) / 2≥1mm, thereby reserving sufficient area for setting the draft angle to meet the requirements of process manufacturing.

[0040] Among them, the battery shell can be adapted to different types of batteries, such as blade batteries or square shell batteries. In the present embodiment, the battery shell is adapted to blade batteries, which includes a total of four walls, which are transitionally connected by arc corners 13, and are distinguished by area. The four walls are two end faces with larger areas and two side faces with smaller areas, wherein the mounting boss 11 is arranged on one of the side faces.

[0041] Alternatively, if Figure 1 and Figure 3 As shown, the spacing dimension between the mounting boss 11 and the arc corner 13 along the first direction is L3, and satisfies L3≥2mm. By limiting the spacing dimension L3 between the mounting boss 11 and the arc corner 13 along the first direction to satisfy L3≥2mm, sufficient area is left between the mounting boss 11 and the arc corner 13, which is convenient for subsequent assembly with the tooling for air tightness testing.

[0042] In this embodiment, after the explosion-proof valve 2 is welded in the mounting groove, it is necessary to perform an airtightness test on the welded housing body 1 and the explosion-proof valve 2 using a sealing ring 200, wherein sealing rings 200 are respectively provided on the inner and outer sides of the wall surface on which the mounting boss 11 is provided, and then the sealing rings 200 on both sides are compressed by the detection tool 100, and helium is introduced through the airway of the detection tool 100 to perform a helium test, wherein the width of the sealing ring 200 is set to at least 1 mm, and the width of the edge of the sealing ring 200 from the mounting boss 11 needs to ensure at least 0.5 mm offset, otherwise the sealing ring 200 will appear. Pressing on the mounting boss 11 will result in invalid detection, and the edge of the sealing ring 200 must be at least 0.5mm offset from the edge of the arc corner 13, otherwise the sealing ring 200 will be pressed on the arc corner 13, which will also result in invalid detection. Therefore, in order to avoid invalid detection, the spacing dimension L3 between the mounting boss 11 and the arc corner 13 along the first direction needs to be greater than the sum of the width of the sealing ring 200 from the mounting boss 11, the width of the sealing ring 200 itself, and the width of the sealing ring 200 from the edge of the arc corner 13, that is, L3≥0.5mm+1mm+0.5mm=2mm.

[0043] In this embodiment, in order to determine the influence of the difference between the length dimension L1 of the mounting boss 11 along the first direction and the length dimension L2 of the mounting groove along the first direction on the welding operation, and the influence of the spacing dimension L3 between the mounting boss 11 and the arc corner 13 along the first direction on the air tightness detection test, as shown in Table 1, four groups of embodiments and four groups of comparative examples are provided for verification.

[0044] Table 1

[0045]

[0046] In Example 1, the difference between the length dimension L1 of the mounting boss 11 along the first direction and the length dimension L2 of the mounting groove along the first direction is set to 1.65 mm, satisfying the range of (L1-L2) / 2≥1 mm, and the spacing dimension L3 between the mounting boss 11 and the arc corner 13 along the first direction is set to 4 mm, satisfying the range of L3≥2 mm. At this time, welding operations and air tightness detection tests can be carried out normally.

[0047] In Example 2, the difference between the length dimension L1 of the mounting boss 11 along the first direction and the length dimension L2 of the mounting groove along the first direction is set to 1.5 mm, satisfying the range of (L1-L2) / 2≥1 mm, and the spacing dimension L3 between the mounting boss 11 and the arc corner 13 along the first direction is set to 3 mm, satisfying the range of L3≥2 mm. At this time, welding operations and air tightness detection tests can be carried out normally.

[0048] In Example 3, the difference between the length dimension L1 of the mounting boss 11 along the first direction and the length dimension L2 of the mounting groove along the first direction is set to 1.6 mm, satisfying the range of (L1-L2) / 2≥1 mm, and the spacing dimension L3 between the mounting boss 11 and the arc corner 13 along the first direction is set to 3.5 mm, satisfying the range of L3≥2 mm. At this time, welding operations and air tightness detection tests can be carried out normally.

[0049] In Example 4, the difference between the length dimension L1 of the mounting boss 11 along the first direction and the length dimension L2 of the mounting groove along the first direction is set to 1.2 mm, satisfying the range of (L1-L2) / 2≥1 mm, and the spacing dimension L3 between the mounting boss 11 and the arc corner 13 along the first direction is set to 2.5 mm, satisfying the range of L3≥2 mm. At this time, welding operations and air tightness detection tests can be carried out normally.

[0050] It can be seen from Examples 1 to 4 that when the difference between the length dimension L1 of the mounting boss 11 along the first direction and the length dimension L2 of the mounting groove along the first direction satisfies the range of (L1-L2) / 2≥1mm, a sufficient welding area is reserved for the welding of the explosion-proof valve 2 and the mounting boss 11, so that the welding operation can be carried out smoothly. When the spacing dimension L3 between the mounting boss 11 and the arc angle 13 along the first direction satisfies the range of L3≥2mm, the sealing ring 200 used for the helium detection test will not interfere with the mounting boss 11 and the arc angle 13, so that the airtightness detection test can be carried out smoothly.

[0051] In Comparative Example 1, the difference between the length dimension L1 of the mounting boss 11 along the first direction and the length dimension L2 of the mounting groove along the first direction is set to 1.4 mm, satisfying the range of (L1-L2) / 2≥1 mm, and the spacing dimension L3 between the mounting boss 11 and the arc corner 13 along the first direction is set to 1.7 mm, which does not satisfy the range of L3≥2 mm. At this time, welding operations can be carried out normally, but air tightness detection tests cannot be carried out.

[0052] In Comparative Example 2, the difference between the length dimension L1 of the mounting boss 11 along the first direction and the length dimension L2 of the mounting groove along the first direction is set to 1.5 mm, satisfying the range of (L1-L2) / 2≥1 mm, and the spacing dimension L3 between the mounting boss 11 and the arc corner 13 along the first direction is set to 1.4 mm, which does not satisfy the range of L3≥2 mm. At this time, welding operations can be carried out normally, but air tightness detection tests cannot be carried out.

[0053] It can be seen from Comparative Examples 1 and 2 that when the spacing dimension L3 between the mounting boss 11 and the arc corner 13 along the first direction is less than the minimum value of L3 ≥ 2 mm, the sealing ring 200 will interfere with the mounting boss 11 or the arc corner 13 during the air tightness detection test, thereby making it impossible to use the sealing ring 200 to achieve a closed detection environment, and therefore making it impossible to perform the air tightness detection test.

[0054] In Comparative Example 3, the difference between the length dimension L1 of the mounting boss 11 along the first direction and the length dimension L2 of the mounting groove along the first direction is set to 0.9 mm, which does not satisfy the range of (L1-L2) / 2≥1 mm. The spacing dimension L3 between the mounting boss 11 and the arc corner 13 along the first direction is set to 2.5 mm, which satisfies the range of L3≥2 mm. At this time, welding operations cannot be performed.

[0055] In Comparative Example 4, the difference between the length dimension L1 of the mounting boss 11 along the first direction and the length dimension L2 of the mounting groove along the first direction is set to 0.6 mm, which does not satisfy the range of (L1-L2) / 2≥1 mm. The spacing dimension L3 between the mounting boss 11 and the arc corner 13 along the first direction is set to 2 mm, which satisfies the range of L3≥2 mm. At this time, welding operations cannot be performed.

[0056] It can be seen from Comparative Examples 3 to 4 that when the difference between the length dimension L1 of the mounting boss 11 along the first direction and the length dimension L2 of the mounting groove along the first direction is less than the minimum value of (L1-L2) / 2≥1mm, sufficient working space cannot be reserved for the welding operation of the explosion-proof valve 2 and the mounting boss 11, and thus the welding operation cannot be performed. Since the explosion-proof valve 2 and the mounting boss 11 cannot be welded, there is no need to perform an airtightness detection test.

[0057] Alternatively, if Figure 1As shown, the weld width dimension e of the explosion-proof valve 2 and the shell body 1 is satisfied by limiting the weld width dimension e of the explosion-proof valve 2 and the shell body 1 to satisfy 0.6mm≤e≤1.5mm. On the one hand, the narrow width after the explosion-proof valve 2 and the shell body 1 are welded, which leads to weak welding strength. On the other hand, the width after the explosion-proof valve 2 and the shell body 1 are welded is avoided to be too wide, which leads to the need to increase the structural dimensions, resulting in dimensional redundancy and waste of materials.

[0058] The weld width dimension e of the explosion-proof valve 2 and the shell body 1 can be any value between 0.6mm and 1.5mm or a range between any two values, such as 0.6mm, 0.7mm, 0.8mm, 0.9mm, 1mm, 1.1mm, 1.2mm, 1.3mm, 1.4mm, 1.5mm, etc.

[0059] Alternatively, if Figure 1 As shown, the depth of penetration of the explosion-proof valve 2 and the shell body 1 is w, and w>0.3mm. By limiting the depth of penetration of the explosion-proof valve 2 and the shell body 1 to satisfy w>0.3mm, it is avoided that the depth of welding of the explosion-proof valve 2 and the shell body 1 is too small, resulting in weak welding strength.

[0060] Alternatively, if Figure 1 As shown, the thickness dimension t1 of the wall surface provided with the mounting boss 11 and the thickness dimension t2 of the wall surface not provided with the mounting boss 11 satisfy 0.1mm≤(t1-t2)≤1.1mm. By limiting the difference between the thickness dimension t1 of the wall surface provided with the mounting boss 11 and the thickness dimension t2 of the wall surface not provided with the mounting boss 11, it is ensured that there is a sufficient thickness difference between the wall surface provided with the mounting boss 11 and the wall surface not provided with the mounting boss 11, thereby reducing the influence of the wall surface provided with the mounting boss 11 on the deformation of the wall surface not provided with the mounting boss 11.

[0061] The difference between the thickness dimension t1 of the wall surface with the mounting boss 11 and the thickness dimension t2 of the wall surface without the mounting boss 11 can be any value between 0.1 mm and 1.1 mm or a range between any two values, for example, 0.1 mm, 0.2 mm, 0.3 mm, 0.4 mm, 0.5 mm, 0.6 mm, 0.7 mm, 0.8 mm, 0.9 mm, 1 mm, 1.1 mm, etc.

[0062] Specifically, the thickness dimension t1 of the wall surface provided with the mounting boss 11 satisfies 0.6 mm≤t1≤1.5 mm, and the thickness dimension t2 of the wall surface not provided with the mounting boss 11 satisfies 0.3 mm≤t2≤0.7 mm.

[0063] The thickness dimension t1 of the wall surface with the mounting boss 11 can be any value between 0.6mm and 1.5mm or a range between any two values, for example, 0.6mm, 0.7mm, 0.8mm, 0.9mm, 1mm, 1.1mm, 1.2mm, 1.3mm, 1.4mm, 1.5mm, etc.; and the thickness dimension t2 of the wall surface without the mounting boss 11 can be any value between 0.3mm and 0.7mm or a range between any two values, for example, 0.3mm, 0.4mm, 0.5mm, 0.6mm, 0.7mm, etc.

[0064] In this embodiment, if Figure 1 and Figure 2 As shown, since the battery type adapted by the battery shell is a blade battery, the shell body 1 has four walls, so the commonly used configuration combinations of the four walls can be: the wall thickness t1 with mounting protrusions is 1.5mm, and the thickness t2 of the other three walls without mounting protrusions is 0.6mm, or the wall thickness t1 with mounting protrusions is 1.2mm, and the thickness t2 of the other three walls without mounting protrusions is 0.6mm, or the wall thickness t1 with mounting protrusions is 1.2mm, and the thickness t2 of the other three walls without mounting protrusions is 0.5mm, or the wall thickness t1 with mounting protrusions is 1mm, and the thickness t2 of the other three walls without mounting protrusions is 0.5mm. The thickness t2 of the other three walls without mounting protrusions is 0.6mm, or the thickness t1 of the wall with mounting protrusions is 1mm, the thickness t2 of the other three walls without mounting protrusions is 0.5mm, or the thickness t1 of the wall with mounting protrusions is 0.8mm, the thickness t2 of the other three walls without mounting protrusions is 0.5mm, or the thickness t1 of the wall with mounting protrusions is 0.8mm, the thickness t2 of the other three walls without mounting protrusions is 0.4mm, or the thickness t1 of the wall with mounting protrusions is 0.6mm, and the thickness t2 of the other three walls without mounting protrusions is 0.35mm. In addition, the radius size of the arc angle 13 is R, and satisfies R=t2+1mm.

[0065] From the above, it can be seen that the present embodiment provides a battery shell having unequal wall thickness and provided with a mounting boss 11 as a reinforcing structure. In addition to this form, the battery shell can also be a battery shell having equal wall thickness and not provided with a mounting boss 11 as a reinforcing structure, a battery shell having unequal wall thickness and not provided with a mounting boss 11 as a reinforcing structure, and a battery shell having equal wall thickness and provided with a mounting boss 11 as a reinforcing structure. In order to verify the effect of a battery shell having unequal wall thickness and provided with a mounting boss 11 provided in the present embodiment compared with the other three types of battery shells, four types of battery shells are tested, that is, the deformation amount of the middle part of the explosion-proof valve 2 on each type of battery shell is observed under the same pressure, as shown in Table 2, and experiments under five different pressures are set for comparative analysis, wherein the gas production pressure of the battery cell is generally less than 0.3MPa.

[0066] Table 2

[0067]

[0068] Under a pressure of 0.1 MPa, the deformation amount of the middle part of the explosion-proof valve 2 on the battery shell of equal wall thickness and no mounting boss 11 structure is 0.25 mm, the deformation amount of the middle part of the explosion-proof valve 2 on the battery shell of unequal wall thickness and no mounting boss 11 structure is 0.17 mm, the deformation amount of the middle part of the explosion-proof valve 2 on the battery shell of equal wall thickness and mounting boss 11 structure is 0.16 mm, and the deformation amount of the middle part of the explosion-proof valve 2 on the battery shell of unequal wall thickness and mounting boss 11 structure is 0.15 mm. It can be seen that under a pressure of 0.1 MPa, the deformation amount of the middle part of the explosion-proof valve 2 on the battery shell of unequal wall thickness and mounting boss 11 structure provided in this embodiment is the smallest.

[0069] Under a pressure of 0.15 MPa, the deformation amount of the middle part of the explosion-proof valve 2 on the battery shell of equal wall thickness without mounting boss 11 is 0.41 mm, the deformation amount of the middle part of the explosion-proof valve 2 on the battery shell of unequal wall thickness without mounting boss 11 is 0.24 mm, the deformation amount of the middle part of the explosion-proof valve 2 on the battery shell of equal wall thickness with mounting boss 11 is 0.21 mm, and the deformation amount of the middle part of the explosion-proof valve 2 on the battery shell of unequal wall thickness with mounting boss 11 is 0.19 mm. It can be seen that under a pressure of 0.15 MPa, the deformation amount of the middle part of the explosion-proof valve 2 on the battery shell of unequal wall thickness with mounting boss 11 provided in this embodiment is the smallest.

[0070] Under a pressure of 0.2Mpa, the deformation amount of the middle part of the explosion-proof valve 2 on the battery shell of equal wall thickness and no mounting boss 11 structure is 0.67mm, the deformation amount of the middle part of the explosion-proof valve 2 on the battery shell of unequal wall thickness and no mounting boss 11 structure is 0.46mm, the deformation amount of the middle part of the explosion-proof valve 2 on the battery shell of equal wall thickness and mounting boss 11 structure is 0.40mm, and the deformation amount of the middle part of the explosion-proof valve 2 on the battery shell of unequal wall thickness and mounting boss 11 structure is 0.29mm. It can be seen that under a pressure of 0.2Mpa, the deformation amount of the middle part of the explosion-proof valve 2 on the battery shell of unequal wall thickness and mounting boss 11 structure provided in this embodiment is the smallest.

[0071] Under a pressure of 0.25 MPa, the deformation amount of the middle part of the explosion-proof valve 2 on the battery shell of equal wall thickness without mounting boss 11 is 0.89 mm, the deformation amount of the middle part of the explosion-proof valve 2 on the battery shell of unequal wall thickness without mounting boss 11 is 0.58 mm, the deformation amount of the middle part of the explosion-proof valve 2 on the battery shell of equal wall thickness with mounting boss 11 is 0.55 mm, and the deformation amount of the middle part of the explosion-proof valve 2 on the battery shell of unequal wall thickness with mounting boss 11 is 0.41 mm. It can be seen that under a pressure of 0.25 MPa, the deformation amount of the middle part of the explosion-proof valve 2 on the battery shell of unequal wall thickness with mounting boss 11 provided in this embodiment is the smallest.

[0072] Under a pressure of 0.3Mpa, the deformation amount of the middle part of the explosion-proof valve 2 on the battery shell of equal wall thickness and no mounting boss 11 is 1.02mm, the deformation amount of the middle part of the explosion-proof valve 2 on the battery shell of unequal wall thickness and no mounting boss 11 is 0.75mm, the deformation amount of the middle part of the explosion-proof valve 2 on the battery shell of equal wall thickness and with mounting boss 11 is 0.68mm, and the deformation amount of the middle part of the explosion-proof valve 2 on the battery shell of unequal wall thickness and with mounting boss 11 is 0.52mm. It can be seen that under a pressure of 0.3Mpa, the deformation amount of the middle part of the explosion-proof valve 2 on the battery shell of unequal wall thickness and with mounting boss 11 provided in this embodiment is the smallest.

[0073] It can be seen from the above that among the four types of battery shells, the deformation of the middle part of the explosion-proof valve 2 on the battery shell with unequal wall thickness and mounting boss 11 structure provided in this embodiment is the minimum under any pressure, so its structural strength is the highest, and the explosion-proof valve 2 is minimally affected by the deformation of the shell body 1, which reduces the probability of leakage, change in explosion value and other problems, reduces the risk of failure, and improves safety.

[0074] Alternatively, if Figure 1As shown, the depth dimension of the installation groove along the second direction is h1, and satisfies 0.3mm≤h1≤0.6mm. By limiting the depth dimension h1 of the installation groove along the second direction to satisfy 0.3mm≤h1≤0.6mm, on the one hand, it is avoided that the depth of the installation groove is too small, resulting in the inability to accommodate the explosion-proof valve 2, and on the other hand, it is avoided that the depth of the installation groove is too large, resulting in the reduction of the thickness of the wall surface provided with the installation boss 11 and the reduction of its structural strength.

[0075] The depth dimension h1 of the mounting groove along the second direction may be any value between 0.3 mm and 0.6 mm or a range between any two values, such as 0.3 mm, 0.4 mm, 0.5 mm, 0.6 mm, etc.

[0076] Alternatively, if Figure 1 As shown, the thickness dimension of the maximum thickness area of ​​the explosion-proof valve 2 along the second direction is h2, and h1≥h2. By making the thickness dimension h2 of the maximum thickness area of ​​the explosion-proof valve 2 along the second direction not greater than the depth dimension h1 of the mounting groove along the second direction, the surface of the mounting boss 11 protruding behind the mounting groove is avoided.

[0077] Alternatively, if Figure 1 As shown, the height dimension of the mounting boss 11 along the second direction is h, and satisfies h1<h≤1mm. By limiting the height dimension h of the mounting boss 11 along the second direction to satisfy h1<h≤1mm, on the one hand, it is prevented that the height of the mounting boss 11 is too small, resulting in the opening of the mounting groove to reduce the thickness dimension of the wall surface provided with the mounting boss 11, resulting in a reduction in its structural strength; on the other hand, it is prevented that the height of the mounting boss 11 is too large, resulting in an excessively large outer dimension of the battery housing, increasing the occupied space, and resulting in a reduction in the capacity density of the battery pack.

[0078] In this embodiment, a battery is also provided, which includes a battery cover, an electrode group and the above-mentioned battery housing, wherein the battery cover is connected to the battery housing to form a closed chamber for accommodating the electrode group. By using the above-mentioned battery housing, the battery reduces the problem of leakage and change in explosion value caused by the pulling of the explosion-proof valve 2 due to the deformation of the shell body 1, and has high quality and safety in use.

[0079] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. For those skilled in the art, various obvious changes, readjustments and substitutions can be made without departing from the protection scope of the present invention. It is not necessary and impossible to list all the embodiments here. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the claims of the present invention.

Claims

1. A battery housing, characterized in that: The battery housing comprises: The shell body comprises a plurality of wall surfaces, any one of the plurality of wall surfaces is provided with a mounting boss, a mounting groove is provided on the mounting boss, a through hole is provided in the mounting groove, and two adjacent wall surfaces are connected via an arc angle transition; The thickness dimension of the wall surface provided with the mounting boss is t1, the thickness dimension of the wall surface not provided with the mounting boss is t2, and t1>t2 is satisfied, the length dimension of the mounting boss along the first direction is L1, the length dimension of the mounting groove along the first direction is L2, and (L1-L2) / 2≥1mm is satisfied; An explosion-proof valve is arranged in the installation groove and welded to the shell body.

2. The battery housing according to claim 1, characterized in that: A spacing dimension between the mounting boss and the arc corner along the first direction is L3, and L3≥2mm.

3. The battery housing according to claim 1, characterized in that: The weld width dimension between the explosion-proof valve and the shell body is e, and satisfies 0.6mm≤e≤1.5mm.

4. The battery housing according to claim 1, characterized in that: The welding depth of the explosion-proof valve and the shell body is w, and w>0.3mm.

5. The battery housing according to claim 1, characterized in that: The thickness dimension t1 of the wall surface provided with the mounting boss and the thickness dimension t2 of the wall surface not provided with the mounting boss satisfy 0.1 mm ≤ ( t1 - t2 ) ≤ 1.1 mm.

6. The battery casing according to claim 5, characterized in that: The thickness dimension t1 of the wall surface provided with the mounting boss satisfies 0.6 mm ≤ t1 ≤ 1.5 mm; The thickness dimension t2 of the wall surface without the mounting boss satisfies 0.3 mm ≤ t2 ≤ 0.7 mm.

7. The battery housing according to claim 1, characterized in that: The depth dimension of the installation groove along the second direction is h1, and satisfies 0.3mm≤h1≤0.6mm.

8. The battery casing according to claim 7, characterized in that: The thickness dimension of the maximum thickness area of ​​the explosion-proof valve along the second direction is h2, and h1≥h2.

9. The battery casing according to claim 7, characterized in that: The height dimension of the mounting boss along the second direction is h, and satisfies h1<h≤1mm.

10. A battery, characterized in that The battery comprises a battery cover, a pole group and a battery casing as claimed in any one of claims 1 to 9, wherein the battery cover is connected to the battery casing to form a closed chamber for accommodating the pole group.

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